US11329306B2 - Cell stacking apparatus and manufacturing system for secondary battery - Google Patents

Cell stacking apparatus and manufacturing system for secondary battery Download PDF

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Publication number
US11329306B2
US11329306B2 US16/433,757 US201916433757A US11329306B2 US 11329306 B2 US11329306 B2 US 11329306B2 US 201916433757 A US201916433757 A US 201916433757A US 11329306 B2 US11329306 B2 US 11329306B2
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electrode
plate
separator assembly
stack
pressing
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US20200185753A1 (en
Inventor
Se Ho KWON
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Hyundai Motor Co
Kia Corp
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Hyundai Motor Co
Kia Motors Corp
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Assigned to KIA MOTORS CORPORATION, HYUNDAI MOTOR COMPANY reassignment KIA MOTORS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KWON, SE HO
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to a cell stacking apparatus for a secondary battery and a system for manufacturing a secondary battery, and more particularly to a cell stacking apparatus and a secondary battery manufacturing system for simplifying a stacking process.
  • a “Z-fold” method is known as a cell stacking method where a separator having negative and positive electrode plates bonded to both sides thereof is folded in zigzags.
  • a cell stack has a form in which the separator is folded in zigzags, and the negative and positive electrode plates are alternately inserted between adjacent separators folded in zigzags.
  • a conventional cell stacking apparatus of a Z-fold type cuts and supplies a negative electrode plate and a positive electrode plate to a separator, arranges the negative electrode plate and the positive electrode plate on one surface and an opposite surface of the separator, respectively, and then folds the separator to stack the electrodes.
  • the conventional cell stacking apparatus of a Z-fold type performs the stacking process without bonding the electrodes and the separator in advance. Accordingly, a cutting apparatus, a supply apparatus, an alignment apparatus, and a stacking apparatus for positive and negative electrode plates and a separator supply apparatus are required, and therefore the cell stacking apparatus becomes complex. Furthermore, the accuracy of the electrode positions and the product manufacturing speed are lowered.
  • a cell stacking apparatus and a secondary battery manufacturing system can provide a simple configuration of equipment, a simplified stacking process, and an improved accuracy in folding and stacking unit cells.
  • a cell stacking apparatus for a secondary battery includes a grip part configured to hold and move an electrode-separator assembly having a plurality of positive electrode plates and a plurality of negative electrode plates, in which each of the plurality of positive electrode plates and each of the plurality of negative electrode plates are respectively bonded to opposing surfaces of a separator, and a stacking part including a stack plate movable in a cell stacking direction.
  • the stacking part is configured to fold and stack the electrode-separator assembly on the stack plate, and further configured to move the stack plate downward to fold the electrode-separator assembly in zigzags when the grip part holds and moves the electrode-separator assembly to the stack plate.
  • a system for manufacturing a secondary battery includes a supply part configured to continuously supply a separator, a negative electrode plate, and a positive electrode plate, an electrode cutting part disposed behind the supply part and configured to cut the negative electrode plate and the positive electrode plate to a predetermined size, an electrode-separator bonding part disposed behind the electrode cutting part and configured to bond the positive electrode plate to one surface of the separator and the negative electrode plate to another surface of the separator opposing the one surface and to apply heat and pressure to form an electrode-separator assembly, a cell stacking apparatus disposed behind the electrode-separator bonding part and configured to fold and stack the electrode-separator assembly in zigzags, and an extraction part configured to extract the stacked electrode-separator assembly from the cell stacking apparatus.
  • the cell stacking apparatus includes a grip part configured to hold and move the electrode-separator assembly and a stacking part including a stack plate movable in a cell stacking direction.
  • the stacking part is configured to fold and stack the electrode-separator assembly on the stack plate, and further configured to move the stack plate downward to fold the electrode-separator assembly in zigzags when the grip part holds and moves the electrode-separator assembly to the stack plate.
  • FIG. 1 is a schematic view illustrating a secondary battery manufacturing system according to one aspect of the present disclosure
  • FIG. 2 is a view illustrating a cell stacking apparatus for a secondary battery according to a first exemplary embodiment of the present disclosure
  • FIG. 3 is a view illustrating a process in which a grip part holds and moves an electrode-separator assembly according to one aspect of the present disclosure
  • FIG. 4 is a view illustrating a process in which a stack plate moves downward to fold the electrode-separator assembly according to one aspect of the present disclosure
  • FIG. 5 is a view illustrating a process in which the electrode-separator assembly is pressed by the stack plate and a pressing plate according to one aspect of the present disclosure
  • FIG. 6 is a view illustrating a grip part according to a second exemplary embodiment of the present disclosure.
  • FIG. 7 is a view illustrating a grip part according to a third exemplary embodiment of the present disclosure.
  • a secondary battery manufacturing system 10 may include a supply part 20 , an electrode cutting part 30 , an electrode-separator bonding part 40 , a cell stacking apparatus 100 , and an extraction part 60 .
  • the supply part 20 may continuously supply a separator 2 , a negative electrode plate 3 , and a positive electrode plate 4 .
  • the supply part 20 may include a separator reel 21 , a negative electrode plate reel 22 , and a positive electrode plate reel 23 .
  • the separator 2 , the negative electrode plate 3 , and the positive electrode plate 4 unwound from the respective reels 21 , 22 , and 23 may be continuously supplied through a web drive part 24 .
  • the electrode cutting part 30 is disposed behind the supply part 20 and cuts the negative electrode plate 3 and the positive electrode plate 4 to a predetermined size.
  • Reference numeral 31 denotes a negative electrode cutting member (e.g., a cutter, etc.) for cutting the negative electrode plate 3
  • reference numeral 32 denotes a positive electrode cutting member (e.g., a cutter, etc.) for cutting the positive electrode plate 4 .
  • the electrode-separator bonding part 40 is provided behind the electrode cutting part 30 .
  • the electrode-separator bonding part 40 is configured to bond the positive electrode plate 4 to one surface of the separator 2 and the negative electrode plate 3 to an opposite surface of the separator 2 and to apply heat and pressure to form an electrode-separator assembly 1 .
  • a plurality of negative electrode plates 3 and a plurality of positive electrode plates 4 which are cut to the predetermined size, may be bonded to the one surface and the opposite surface of the continuously supplied separator 2 , respectively.
  • a bonding method of applying heat and pressure using a hot rolling roller may be applied to the electrode-separator bonding part 40 .
  • a bonding method is not limited thereto.
  • the plurality of positive electrode plates 4 may be bonded to the one surface of the separator 2 , but spaced apart from each other to forma separation area therebetween, and the plurality of negative electrode plates 3 may be bonded to the opposite surface of the separator 2 , but located to correspond to the separation areas.
  • the state in which the negative electrode plates 3 and the positive electrode plates 4 are bonded to the separator 2 is not limited to the embodiment illustrated.
  • the negative electrode plates 3 and the positive electrode plates 4 may be disposed in positions corresponding to the one surface and the opposite surface of the separator 2 .
  • the cell stacking apparatus 100 is provided behind the electrode-separator bonding part 40 and folds and stacks the electrode-separator assembly 1 in zigzags.
  • the separator 2 may be folded in zigzags between which the positive electrode plates 4 and the negative electrode plates 3 are alternately inserted.
  • a separator cutting part 50 may be provided in front of the cell stacking apparatus 100 .
  • the separator cutting part 50 e.g., a cutter, etc.
  • the separator cutting part 50 may cut the separator 2 according to an electrode stack standard.
  • the extraction part 60 extracts the stacked electrode-separator assembly 1 from the cell stacking apparatus 100 .
  • the cell stacking apparatus 100 includes a grip part 200 and a stacking part 300 .
  • the grip part 200 holds and moves the electrode-separator assembly 1 having the plurality of positive electrode plates 4 and the plurality of negative electrode plates 3 that are bonded to the one surface and the opposite surface of the separator 2 , which extends in a predetermined direction, respectively.
  • the cell stacking apparatus 100 is based on folding and stacking the electrode-separator assembly 1 having the positive electrode plates 4 and the negative electrode plates 3 bonded to the separator 2 . Furthermore, in the case where the electrodes (the positive electrode plates 4 and the negative electrode plates 3 ) and the separator 2 are bonded by applying pressure/heat using a hot rolling roller when manufacturing the electrode-separator assembly 1 as described above, the accuracy of bonding positions may be secured. Accordingly, the meandering accuracy between the electrodes (the positive electrode plates 4 and the negative electrode plates 3 ) may be secured when the electrode-separator assembly 1 is folded.
  • the stacking part 300 may include the stack plate 310 that is movable in the cell stacking direction. Furthermore, the stacking part 300 may fold and stack the electrode-separator assembly 1 on the stack plate 310 .
  • the stacking part 300 moves the stack plate 310 downward to cause the electrode-separator assembly 1 to be folded in zigzags.
  • the folded electrode-separator assembly 1 may be repeatedly stacked on the stack plate 310 to form one stack cell.
  • the electrode-separator assembly 1 may be bent about distal ends of the positive electrode plates 4 or the negative electrode plates 3 and folded in zigzags.
  • the cell stacking apparatus 100 includes the grip part 200 for moving the electrode-separator assembly 1 and the stack plate 310 that is operated in the cell stacking direction. Accordingly, the cell stacking apparatus 100 may simplify the stacking process. Furthermore, the cell stacking apparatus 100 according to one aspect of the present disclosure forms folding lines while maintaining the bonding structure by using the electrode-separator assembly 1 having the electrode plates 3 and 4 bonded to the separator 2 . Accordingly, the cell stacking apparatus 100 may fold and stack the electrode-separator assembly 1 in zigzags by simply moving the stack plate 310 downward when the electrode-separator assembly 1 is moved.
  • the cell stacking apparatus 100 may further include a pressing part 400 .
  • the pressing part 400 may press the electrode-separator assembly 1 toward the stack plate 310 to fix the folded state of the electrode-separator assembly 1 .
  • the electrode-separator assembly 1 folded in zigzags may be fixed, and one layer may be completely stacked.
  • the pressing part 400 may include a pressing plate 410 that presses an upper surface of the electrode-separator assembly 1 stacked on the stack plate 310 .
  • the pressing plate 410 may be formed of a plate parallel to the stack plate 310 .
  • the stacking part 300 may move the stack plate 310 upward again.
  • the pressing part 400 may move the pressing plate 410 to a higher position than the stack plate 310 before the stack plate 310 moves upward, and may press the electrode-separator assembly 1 toward the stack plate 310 when the stack plate 310 moves upward. That is, the electrode-separator assembly 1 may be pressed between the stack plate 310 and the pressing plate 410 when the stack plate 310 moves upward.
  • the stacking part 300 may further include a stack plate moving part 330 .
  • the stack plate moving part 330 e.g., an actuator, etc.
  • the stack plate moving part 330 may be provided below the stack plate 310 and may move the stack plate 310 upward and downward. No special limitation applies to a method of moving the stack plate 310 by the stack plate moving part 330 , and various methods may be applied.
  • a direction in which the electrode-separator assembly 1 moves is defined as a first direction D 1
  • a direction perpendicular to the first direction D 1 and toward the electrode-separator assembly 1 is defined as a second direction D 2 .
  • a layer in which the electrode-separator assembly 1 is folded and stacked once is referred to as an p-layer.
  • the layer stacked before the n-layer is referred to as an (n ⁇ 1) layer
  • the layer to be stacked after the n-layer is referred to as an (n+1) layer.
  • n is a natural number of 2 or larger.
  • the grip part 200 may include a pair of grippers 210 and a gripper moving part 230 .
  • the pair of grippers 210 may move toward or away from each other.
  • the pair of grippers 210 may be disposed in positions corresponding to opposite surfaces of the electrode-separator assembly 1 when holding the electrode-separator assembly 1 and may extend in a direction parallel to the second direction D 2 .
  • the electrode-separator assembly 1 may be inserted between the pair of grippers 210 .
  • the pair of grippers 210 may hold the electrode-separator assembly 1 while moving toward each other and may release the holding of the electrode-separator assembly 1 while moving away from each other.
  • the gripper moving part 230 may include a first gripper moving member 240 and a second gripper moving member 250 .
  • the first gripper moving member 240 may include a mounting block 241 , a first gripping block 242 , and a first gripping actuator (not illustrated).
  • the pair of grippers 210 may be mounted to the mounting block 241 so as to be movable toward or away from each other. Specifically, the pair of grippers 210 may vertically move toward or away from each other while operating in conjunction with each other.
  • the mounting block 241 may be mounted in the first gripping block 242 so as to be movable in the first direction D 1 or the opposite direction to the first direction D 1 .
  • the first gripping actuator may provide a driving force to move the mounting block 241 . That is, the mounting block 241 may be reciprocally moved in the first direction D 1 and the opposite direction thereto by the first gripping actuator.
  • the second gripper moving member 250 may include a second gripping block 251 and a second gripping actuator (not illustrated).
  • the first gripping block 242 may be mounted to the second gripping block 251 so as to be movable in the second direction D 2 or the opposite direction to the second direction D 2 .
  • the second gripping actuator may provide a driving force to move the second gripping block 251 . That is, the second gripping block 251 may be reciprocally moved in the second direction D 2 and the opposite direction thereto by the second gripping actuator. Accordingly, the pair of grippers 210 may move toward or away from the electrode-separator assembly 1 .
  • Various drive means such as a drive motor or a cylinder may be applied to the first gripping actuator and the second gripping actuator without any specific limitation.
  • the first gripper moving member 240 may move the mounting block 241 in the first direction D 1 . Accordingly, the electrode-separator assembly 1 may be moved to the stacking part 300 .
  • the pair of grippers 210 may move away from each other to release the holding of the electrode-separator assembly 1 .
  • the second gripper moving member 250 may move the first gripping block 242 in the opposite direction to the second direction D 2 .
  • the grippers 210 may move away from the electrode-separator assembly 1 .
  • the first gripper moving member 240 may move the mounting block 241 in the opposite direction to the first direction D 1 to cause the grippers 210 to move to the initial position for stack of the (n+1) layer. Specifically, after moving in the opposite direction to the first direction D 1 and returning to the initial holding position, the grippers 210 may stand ready for stacking the (n+1) layer.
  • the pressing part 400 may further include a first pressing-plate moving member 430 and a second pressing-plate moving member 450 .
  • the first pressing-plate moving member 430 may include a first pressing-plate block 431 , to which the pressing plate 410 is mounted so as to be movable upward and downward, and a first pressing-plate actuator (not illustrated) for providing a driving force to move the pressing plate 410 upward and downward.
  • the first pressing-plate block 431 may have a slot formed thereon for guiding a vertical movement of the pressing plate 410 .
  • the second pressing-plate moving member 450 may include a second pressing-plate block 451 , to which the first pressing-plate block 431 is mounted so as to be movable toward or away from the stacking part 300 , and a second pressing-plate actuator (not illustrated) for providing a driving force to move the first pressing-plate block 431 .
  • the second pressing-plate block 451 may have a slot formed thereon for guiding a horizontal movement of the first pressing-plate block 431 .
  • the first pressing-plate block 431 and the second pressing-plate block 451 are not limited to those described above, and various drive means such as a drive motor may be applied to the first and second pressing-plate actuators.
  • the pressing plate 410 may be located on an upper surface of the electrode-separator assembly 1 stacked in the (n ⁇ 1) layer before the stack plate 310 moves downward for the stack of the n-layer. Thereafter, the first pressing-plate moving member 430 may move the pressing plate 410 downward in conjunction with the stack plate 310 when the stack plate 310 moves downward for the stack of the n-layer. Accordingly, the pressing plate 410 moves downward together with the stack plate 310 while pressing the electrode-separator assembly 1 stacked in the (n ⁇ 1) layer.
  • the second pressing-plate moving member 450 may move the first pressing-plate block 431 to space the pressing plate 410 apart from the electrode-separator assembly 1 stacked in the (n ⁇ 1) layer. Specifically, after the stack plate 310 moves to the lowermost position, the pressing plate 410 may release the pressing and may move away from the electrode-separator assembly 1 .
  • the first pressing-plate moving member 430 may move the pressing plate 410 upward.
  • the second pressing-plate moving member 450 may move the first pressing-plate block 431 to move the pressing plate 410 to a higher position than the electrode-separator assembly 1 to be stacked in the n-layer.
  • the electrode-separator assembly 1 stacked on the stack plate 310 may be pressed by the pressing plate 410 .
  • FIG. 6 is a view illustrating a grip part 200 according to a second embodiment of the present disclosure
  • FIG. 7 is a view illustrating a grip part 200 according to a third embodiment of the present disclosure.
  • the grip part 200 may include a first grip part 200 a and a second grip part 200 b disposed to face the first grip part 200 a with an electrode-separator assembly 1 disposed therebetween.
  • a position where the grip part 200 holds the electrode-separator assembly 1 to stack an n-layer on a stack plate 310 may be referred to as a first holding position
  • a position where the grip part 200 holds the electrode-separator assembly 1 to stack an (n+1) layer on the stack plate 310 may be referred to as a second holding position. While a pair of first grippers 210 a of the first grip part 200 a hold the first holding position, a pair of second grippers 210 b of the second grip part 200 b may stand ready for holding the second holding position.
  • the grip part 200 is a dual gripper that includes the first grip part 200 a and the second grip part 200 b .
  • the first grip part 200 a and the second grip part 200 b may be symmetric to each other with respect to the electrode-separator assembly 1 and may have the same configuration.
  • the second grippers 210 b may move in the opposite direction to a first direction D 1 and may stand ready for holding the second holding position. Accordingly, immediately after the first grippers 210 a completely perform the folding process, the second grippers 210 b may perform a moving and folding process.
  • first grip part 200 a and the second grip part 200 b may sequentially perform the processes, thereby improving the processing speed.
  • the first grip part 200 a and the second grip part 200 b may consistently assist with the movement of the electrode-separator assembly 1 , thereby improving process stability.
  • the grip part 200 may include a third grip part 200 c and a fourth grip part 200 d disposed to face the third grip part 200 c with an electrode-separator assembly 1 disposed therebetween.
  • a pair of third grippers 210 c of the third grip part 200 c and a pair of fourth grippers 210 d of the fourth grip part 200 d may extend toward each other, but may be arranged on the same line.
  • the third grippers 210 c and the fourth grippers 210 d may simultaneously hold the electrode-separator assembly 1 and may move together.
  • the grip part 200 is configured in such a manner that the third grippers 210 c and the fourth grippers 210 d simultaneously move. Because the third grippers 210 c and the fourth grippers 210 d operate at the same time, the third grippers 210 c and the fourth grippers 210 d may be longer than the first grippers 210 a and the second grippers 210 b to prevent interference between the third grippers 210 c and the fourth grippers 210 d.
  • the grip part 200 according to the third embodiment enables a reduction in the stroke of an apparatus for moving the third and fourth grippers 201 c and 210 d toward or away from the electrode-separator assembly 1 , and therefore the configuration of the cell stacking apparatus 100 may be simplified. Furthermore, the grip part 200 according to the third embodiment may improve the processing speed.
  • the grip part 200 according to the third embodiment may improve the accuracy of folding and stacking because the third grippers 210 c and the fourth grippers 210 d on the opposite sides simultaneously hold and move the electrode-separator assembly 1 .
  • the cell stacking apparatus forms folding lines while maintaining the bonding structure by using the electrode-separator assembly having the electrode plates bonded to the separator. Accordingly, the cell stacking apparatus may fold and stack the electrode-separator assembly in zigzags by simply moving the stack plate downward when the electrode-separator assembly is moved.
  • the present disclosure enables simplification of the cell stacking structure and process and an improvement in the stacking accuracy and the processing speed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
US16/433,757 2018-12-06 2019-06-06 Cell stacking apparatus and manufacturing system for secondary battery Active 2040-10-06 US11329306B2 (en)

Applications Claiming Priority (2)

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KR10-2018-0156414 2018-12-06
KR1020180156414A KR20200069171A (ko) 2018-12-06 2018-12-06 이차전지의 셀 스태킹 장치 및 이차전지의 제조시스템

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CN110380128B (zh) * 2019-07-16 2020-06-30 蜂巢能源科技有限公司 模切叠片系统及方法
CN110364766B (zh) * 2019-07-16 2022-06-21 蜂巢能源科技有限公司 模切叠片系统及方法
CN111864248A (zh) * 2020-08-20 2020-10-30 深圳吉阳智能科技有限公司 一种叠片系统及电芯堆叠方法
KR102320193B1 (ko) * 2021-04-13 2021-11-02 (주)지피아이 폴딩방식을 이용한 2차전지 스테킹 방법
KR102322077B1 (ko) * 2021-04-13 2021-11-04 (주)지피아이 폴딩플레이트를 구비한 2차전지 스테킹 장치
WO2022219577A1 (en) * 2021-04-16 2022-10-20 Manz Italy S.R.L. Stacking method and stacking unit to form a stack of electrochemical cells of an electric battery
IT202100009626A1 (it) 2021-04-16 2022-10-16 Manz Italy Srl Unita' impilatrice e metodo di impilamento per formare una pila di celle elettrochimiche di una batteria elettrica
WO2023282722A1 (en) * 2021-07-09 2023-01-12 Lg Energy Solution, Ltd. Assembly manufacturing equipment and method for electrode assembly
IT202100030239A1 (it) * 2021-11-30 2023-05-30 P I T S R L Macchina per la realizzazione di dispositivi di accumulo di energia elettrica
WO2024007193A1 (zh) * 2022-07-06 2024-01-11 宁德时代新能源科技股份有限公司 电芯堆叠设备和电池组装设备

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KR101730469B1 (ko) 2015-12-21 2017-04-27 주식회사 디에이테크놀로지 이차전지의 고속 셀 스택 제조장치

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KR101730469B1 (ko) 2015-12-21 2017-04-27 주식회사 디에이테크놀로지 이차전지의 고속 셀 스택 제조장치

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